Move super.initState() to top of initState()

lib/ui/viewer/file/thumbnail_widget.dart

@@ -63,8 +63,8 @@ class _ThumbnailWidgetState extends State<ThumbnailWidget> {
 
   @override
   void initState() {
-    assignOptimizedImageDimensions();
     super.initState();
+    assignOptimizedImageDimensions();
   }
 
   @override